#include <iostream>

using namespace std;

void printNum(int num_1, int &num_2);

int main()
{
  int number = 3;
  int &number_ref = number;
//  cout << "number = " << number << ", &number_ref = " << number_ref << endl;
  printNum(number, number_ref);

  number++;
  printNum(number, number_ref);

  number_ref++;
  printNum(number, number_ref);

  number_ref = 100;
  printNum(number, number_ref);
 
  number = 200;
  printNum(number, number_ref);

  return 0;
}

void printNum(int num_1, int &num_2)
{
  cout << "number = " << num_1 << ", &number_ref = " << num_2 << endl;
}
